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UPSC Civil Service Exam Questions - Engineering

Q1:

Consider the following statements :
In the bar chart planning
1. Interdependence of the operations cannot be portrayed
2. Progress of work can be measured
3. Spare time of the activities can be determined
4. Schedule cannot be updated
Of these statements :

A 1, 2 and 3 are correct

B 1 and 4 are correct

C 2, 3 and 4 are correct

D 1, 2 and 4 are correct

ANS:B - 1 and 4 are correct

Please explain the given answer.